ALM-303046946 Invalid Packet

Description

SECE/4/ARP_PACKET_CHECK:OID=[OID] Invalid packet.(SourceInterface=[OCTET], SourceIP=[OCTET], SourceMAC=[OCTET], PVLAN=[INTEGER], CVLAN=[INTEGER])

The system detects invalid ARP packets.

Attribute

Alarm ID	Alarm Severity	Alarm Type
303046946	Warning	equipmentAlarm

Parameters

Name	Meaning
OID	Indicates the MIB object ID of the alarm.
SourceInterface	Indicates the source interface of packets.
SourceIP	Indicates the source IP address of packets.
SourceMAC	Indicates the source MAC address of packets.
PVLAN	Indicates the outer VLAN ID of packets.
CVLAN	Indicates the inner VLAN ID of packets.

Impact on the System

If this alarm is generated, the AC may be attacked. If the attack traffic volume is heavy, the AC is busy processing attack packets. As a result, services of authorized users are interrupted.

Possible Causes

The AC receives invalid ARP packets.

Procedure

Find the interface where the gateway conflict occurs according to the value of SourceInterface.
Lock the user who sends gateway conflict packets according to the values of SourceMAC and PVLAN.
Check whether the allocated address of the user conflicts with the gateway address. If the address conflicts, allocate an address to the user again. If the address does not conflict, the user may be the attacker. In this case, you can take such measures as disconnecting the user.